De FAQ staat in die link:
Frequently Asked Questions (more questions are available)
How many active volcanoes are there? | 40-50 continuing eruptions at any given time.
Has volcanic activity been increasing? | No.
What was erupting in the year...? | Range of 56-88 total eruptions per year since 1994.
What volcanoes have had the longest eruptions? | 91 eruptions 5 years or longer.
What volcanoes have the most people living nearby? | 10 have >1 million people within 5 km.
What volcanoes are the most noteworthy? | 185 volcanoes with significant activity or impacts.
https://volcano.si.edu/